Being a fan of the movie The Sound of Music I am rather glad that the Australian Treasury has a model called Maria. Some of the lyrics from that musical are also quite relevant to the Treasury model: “How do you solve a problem like Maria? How do you catch a cloud and pin it down?” The Model of Australian Retirement Incomes and Assets (MARIA) is a dynamic microsimulation model that seeks to model the life paths of all Australians and to project future retirement savings and income in retirement. It uses a range of ATO and Department of Social...